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Crossref Metadata Search vs Quran-api

Same instrument, two spec sheets — measured, not claimed.

APICrossref Metadata SearchNEW—Quran-apiNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licenseOpen Crossref metadata (much is CC0)Unverified
Free tierFree, no key (public pool)Free, no key (static CDN JSON files)
Rate limit5 requests/second, 1 concurrent (public pool, per X-Rate-Limit headers)None (served as static files from jsDelivr CDN)
In directory since2026-07-052026-07-05
operationalpartialdownno data

Crossref Metadata Search vs Quran-api: common questions

Which is more reliable, Crossref Metadata Search or Quran-api?

On our scheduled checks, Quran-api leads on measured uptime — Crossref Metadata Search at —% versus Quran-api at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do Crossref Metadata Search and Quran-api need an API key?

Neither needs a paid key — Crossref Metadata Search is callable with no signup, and Quran-api is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Crossref Metadata Search and Quran-api from the browser?

Yes — both Crossref Metadata Search and Quran-api send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are Crossref Metadata Search and Quran-api free for commercial use?

Crossref Metadata Search allows commercial use on its free tier, and Quran-api has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.